.chat-history-sidebar{--text-primary: #eef0f6;--text-secondary: rgba(238, 240, 246, .66);--text-tertiary: rgba(238, 240, 246, .42);--border: rgba(255, 255, 255, .08);--border-strong: rgba(255, 255, 255, .17);--surface-1: rgba(255, 255, 255, .05);--surface-2: rgba(255, 255, 255, .08);--surface-3: rgba(255, 255, 255, .13);--sidebar-hover: rgba(255, 255, 255, .07);--sidebar-active: rgba(217, 119, 87, .22);--accent: #d97757;--accent-hover: #e68b6d;--accent-soft: rgba(217, 119, 87, .18);--accent-contrast: #ffffff;position:fixed;top:0;left:0;background:radial-gradient(circle at top left,#242a3d,#12141f);color:var(--text-primary);display:flex;flex-direction:column;width:280px;min-width:280px;max-width:280px;height:100dvh;overflow:hidden;border-right:1px solid var(--border);z-index:100;font-family:var(--font-mono)}html[data-theme=dark] .chat-history-sidebar{background:#1f1f1d;--text-primary: #edebe6;--text-secondary: #b1ada1;--text-tertiary: #8a8578;--border: rgba(237, 235, 230, 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var(--border);border-radius:var(--radius-sm);background:var(--surface-1)}.sidebar-profile-plan{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 8px;border-radius:var(--radius-xs);background:var(--surface-2)}.sidebar-profile-plan-info{display:flex;flex-direction:column;gap:1px;min-width:0}.sidebar-profile-row-label{font-size:10px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-tertiary)}.sidebar-profile-plan-name{font-size:13px;font-weight:600;color:var(--text-primary)}.sidebar-profile-upgrade{display:inline-flex;align-items:center;gap:4px;padding:6px 12px;border-radius:var(--radius-full);background:var(--accent);color:var(--accent-contrast);font-size:12px;font-weight:600;text-decoration:none;flex-shrink:0;transition:background var(--dur-fast) ease,transform var(--dur-fast) var(--ease-out)}.sidebar-profile-upgrade:hover{background:var(--accent-hover);transform:translateY(-1px)}.sidebar-profile-row{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:2px 8px}.sidebar-profile-logout{display:flex;align-items:center;gap:8px;width:100%;padding:7px 8px;border:none;border-radius:var(--radius-xs);background:transparent;color:var(--text-secondary);font-family:var(--font-mono);font-size:12px;cursor:pointer;transition:background var(--dur-fast) ease,color var(--dur-fast) ease}.sidebar-profile-logout:hover{background:var(--danger-soft);color:var(--danger)}.theme-toggle{display:inline-flex;align-items:center;gap:2px;background:var(--sidebar-hover);border:1px solid var(--border);border-radius:var(--radius-full);padding:3px;flex-shrink:0}.theme-toggle-seg{display:inline-flex;align-items:center;justify-content:center;width:28px;height:24px;border:none;background:transparent;color:var(--text-tertiary);border-radius:var(--radius-full);cursor:pointer;padding:0;transition:background var(--dur-fast) ease,color var(--dur-fast) ease}.theme-toggle-seg:hover{color:var(--text-primary)}.theme-toggle-seg.is-active{background:var(--surface-1);color:var(--accent);box-shadow:var(--shadow-1)}.chat-history-sidebar.collapsed{width:64px;min-width:64px;max-width:64px}.chat-history-sidebar.collapsed .sidebar-navigation{padding:12px 8px;display:flex;flex-direction:column;align-items:center}.chat-history-sidebar.collapsed .nav-brand-sidebar{justify-content:center;margin-bottom:8px}.chat-history-sidebar.collapsed .collapsed-logo{width:36px;height:36px;margin:0 auto}.chat-history-sidebar.collapsed .brand-identity-sidebar,.chat-history-sidebar.collapsed .brand-actions-sidebar,.chat-history-sidebar.collapsed .nav-collapse-section,.chat-history-sidebar.collapsed .sidebar-profile{display:none!important}.sidebar-edge-toggle{position:absolute;top:50%;right:-12px;transform:translateY(-50%);width:24px;height:48px;padding:0;margin:0;display:flex;align-items:center;justify-content:center;background:#191c29;border:1px solid var(--border-strong);border-left:none;border-radius:0 var(--radius-xs) var(--radius-xs) 0;color:var(--text-tertiary);cursor:pointer;z-index:20;transition:background var(--dur-fast) ease,color var(--dur-fast) ease}.sidebar-edge-toggle:hover{background:var(--surface-2);color:var(--text-primary)}.chat-history-sidebar.collapsed .sidebar-edge-toggle{right:-12px}html[data-theme=dark] .sidebar-edge-toggle{background:#1f1f1d}@media(max-width:1024px){.sidebar-close-btn-fixed{display:inline-flex!important}.sidebar-backdrop{display:block}.sidebar-backdrop.is-open{opacity:1;pointer-events:auto}.chat-history-sidebar.is-closed{display:none!important}.chat-history-sidebar{width:min(320px,85vw);max-width:320px;z-index:1100;border-radius:0;box-shadow:var(--shadow-2)}}.sidebar-fab-open{display:none!important;position:fixed!important;inset-inline-start:14px;bottom:calc(16px + 15%);width:44px;height:44px;border-radius:var(--radius-md)!important;border:1px solid var(--border-strong)!important;background:var(--surface-1)!important;color:var(--text-primary)!important;box-shadow:var(--shadow-2)!important;z-index:1050;transition:transform var(--dur-fast) ease,box-shadow var(--dur-fast) ease!important}.sidebar-fab-open:hover{transform:translateY(-2px)}@media(max-width:1024px){.sidebar-fab-open{display:inline-flex!important}.sidebar-fab-open.hidden{display:none!important}}@media(max-width:640px){.chat-history-sidebar.overlay{height:100dvh}.sidebar-navigation{padding:14px 12px 10px}.sidebar-fab-open{inset-inline-start:12px;bottom:calc(12px + 15%)}}[dir=rtl] .chat-history-sidebar{left:auto;right:0;border-right:none;border-left:1px solid var(--border)}[dir=rtl] .chat-history-sidebar.overlay{left:auto;right:0}[dir=rtl] .sidebar-edge-toggle{right:auto;left:-12px;border-left:1px solid var(--border-strong);border-right:none;border-radius:var(--radius-xs) 0 0 var(--radius-xs)}[dir=rtl] .chat-history-sidebar.collapsed .sidebar-edge-toggle{right:auto;left:-12px}